Homeless Snail

The word to describe any given person trying (and failing) to differentiate between 2 similiar things.

Person 1: I’m afraid of slugs, but I like snails
Person 2: but they’re the same thing
Person 1: no slugs don’t have antennas and snails have shells
Person 2: Slugs have antennas: and you’re telling me you are scared of slugs because they are homeless snails